Pro tip... If you find yourself doing unconventional frame rates, make the framerate an integer and divide by 100.
Recently I had a video shoot request 23.98 rather than 24 fps. 23.98 isn't an option in the drop down and you can't type in custom frame rates like you can the resolution menu options, so the solution was to use a custom frame rate which was 2398 over 100 which equal 23.98 when you divide the two. It took me a min to figure that one out.